Sludge drying system utilizing waste heat of cooling tower of power plant

Abstract

The utility model discloses a sludge drying system utilizing waste heat of a cooling tower of a power plant, which comprises the cooling tower and further comprises a sludge conveying belt group, a cold water collecting tank and a support column are arranged at the bottom of the cooling tower, the cooling tower is arranged above the cold water collecting tank through the support column, a spraying system and a filler layer are sequentially arranged in the cooling tower from top to bottom, and the sludge conveying belt group is arranged in the cooling tower. The sludge conveying belt group comprises an in-tower part and an out-tower part which are connected in sequence, the sludge conveying belt group of the in-tower part is arranged above the spraying system, and the sludge conveying belt group of the out-tower part is connected to the outer wall of the cooling tower in a penetrating manner. Sludge dewatering and reduction are combined into the cooling tower of the power plant, waste heat in the cooling tower of the power plant is fully utilized, sludge is efficiently dewatered and reduced in a unique arrangement mode, the energy utilization rate of the power plant is increased, and contribution is made to reduction work of sludge treatment.

Description

Technical Field

[0001] This utility model relates to a sludge drying system that utilizes waste heat from power plant cooling towers, belonging to the field of cooling tower waste heat utilization technology. Background Technology

[0002] With energy and environmental issues becoming increasingly severe, improving the energy efficiency and reducing pollution of my country's power generation enterprises has become one of the key issues in the industry today. Power plant circulating cooling water needs to be cooled down by cooling towers before use, but cooling towers lose more than 50% of their heat, which is wasted through large amounts of hot air discharged into the atmosphere. Utility Model Content

[0003] The purpose of this invention is to provide a sludge drying system that utilizes the waste heat of power plant cooling towers. This system integrates sludge dewatering and volume reduction into the power plant cooling tower, making full use of the waste heat in the cooling tower. Through a unique arrangement, it efficiently dewaters and reduces the volume of sludge, thereby improving the energy utilization rate of the power plant and contributing to the reduction of sludge treatment.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a sludge drying system utilizing the waste heat of a power plant cooling tower, including a cooling tower and a sludge conveyor belt assembly. The cooling tower has a cold water collection tank and supporting columns at its bottom, and is positioned above the cold water collection tank via the supporting columns. Inside the cooling tower, a spray system and a packing layer are arranged sequentially from top to bottom. The sludge conveyor belt assembly includes an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly is positioned above the spray system, while the outer part is connected through the outer wall of the cooling tower. By integrating sludge dewatering and weight reduction into the power plant cooling tower, the waste heat in the cooling tower is fully utilized. The unique arrangement efficiently dewaters and reduces the weight of the sludge, improving the energy utilization rate of the power plant and contributing to sludge reduction efforts.

[0005] The aforementioned sludge drying system utilizing waste heat from a power plant cooling tower includes a sludge inlet belt, a sludge outlet belt, and an in-tower sludge conveyor belt. Both the sludge inlet belt and the sludge outlet belt are located outside the tower. The outlet of the sludge inlet belt penetrates the outer wall of the cooling tower and connects to the inlet of the in-tower sludge conveyor belt. The inlet of the sludge outlet belt penetrates the outer wall of the cooling tower and connects to the outlet of the in-tower sludge conveyor belt.

[0006] The aforementioned sludge drying system utilizing waste heat from a power plant cooling tower employs a spiral conveyor belt for the sludge conveyor inside the tower. This spiral structure increases the length of the conveyor belt and the contact time between the municipal sludge and the upward-moving hot air in the cooling tower, ensuring the drying effect.

[0007] The aforementioned sludge drying system utilizing waste heat from a power plant cooling tower includes a conveyor belt support inside the cooling tower, with the sludge conveyor belt inside the tower connected to the cooling tower via the conveyor belt support.

[0008] The aforementioned sludge drying system utilizing waste heat from a power plant cooling tower includes a municipal sludge transport system and a dried sludge transport system connected to the cooling tower. The municipal sludge transport system is connected to the inlet of the sludge conveyor belt, and the dried sludge transport system is connected to the outlet of the sludge conveyor belt.

[0009] The aforementioned sludge drying system utilizing waste heat from a power plant cooling tower has a sludge conveyor belt positioned in the upper middle part of the cooling tower.

[0010] The aforementioned sludge drying system utilizing waste heat from a power plant cooling tower includes a cold water collection tank connected to a power plant condenser, which is also connected to a spray system.

[0011] Compared with existing technologies, the support column of this utility model has a hollow structure, allowing surrounding cold air to enter the cooling tower. After entering the cooling tower from the bottom, the surrounding cold air forms a temperature and density difference with the hot water in the packing layer. Since higher gas temperatures result in lower densities, the hotter air rises. Due to the structure of the cooling tower, this upward movement is accelerated. As the hot air rises, the air pressure at the bottom decreases, allowing outside cold air to replenish it, reheating it and accelerating it upwards to form a gas circulation. The hot water in the power plant condenser, after passing through the packing layer and contacting the surrounding cold air, loses heat through heat exchange and ultimately becomes cooling water, flowing downwards to the cold water collection pool. In the process, the cooled water can be returned to the power plant condenser for reuse; municipal sludge enters the cooling tower via a sludge conveyor belt, located in the middle of the cooling tower above the hot water spray nozzles of the spray system; the municipal sludge is spirally conveyed upwards in the cooling tower by a spiral conveyor belt, which increases the length of the conveyor belt and the contact time between the municipal sludge and the upward-moving hot air in the cooling tower, ensuring the drying effect; after drying, the sludge is conveyed out of the cooling tower via a sludge exit belt and enters the dried sludge transportation system. After the entire drying process, the moisture content of the municipal sludge can be reduced from 80% to 30%. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a top view of the sludge conveyor belt assembly placed inside the cooling tower in this utility model.

[0014] Attached reference numerals: 1-Cooling tower, 2-Sludge conveyor belt assembly, 3-Cold water collection tank, 4-Support column, 5-Spray system, 6-Packing layer, 7-Sludge inlet conveyor belt, 8-Sludge outlet conveyor belt, 9-Sludge conveyor belt inside the tower, 10-Conveyor belt support, 11-Municipal sludge transportation system, 12-Dried sludge transportation system, 13-Power plant condenser.

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Detailed Implementation

[0016] Embodiment 1 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 is provided with a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is arranged above the cold water collection tank 3 via the support column 4. A spray system 5 and a packing layer 6 are arranged sequentially from top to bottom inside the cooling tower 1. The sludge conveyor belt assembly 2 includes an inner part and an outer part connected sequentially. The sludge conveyor belt assembly 2 in the inner part of the tower is placed above the spray system 5, and the sludge conveyor belt assembly 2 in the outer part of the tower is connected through the outer wall of the cooling tower 1.

[0017] Embodiment 2 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 has a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is positioned above the cold water collection tank 3 via the support column 4. Inside the cooling tower 1, from top to bottom, are a spray system 5 and a packing layer 6. The sludge conveyor belt assembly 2 comprises an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly 2 is positioned within the spray system... Above the cooling tower 5, the sludge conveyor belt group 2 of the outer part of the tower is connected to the outer wall of the cooling tower 1; the sludge conveyor belt group 2 includes a sludge conveying inlet belt 7, a sludge conveying outlet belt 8 and an inner sludge conveyor belt 9. The sludge conveying inlet belt 7 and the sludge conveying outlet belt 8 are both outside the tower. The outlet of the sludge conveying inlet belt 7 is connected to the inlet of the inner sludge conveyor belt 9 through the outer wall of the cooling tower 1. The inlet of the sludge conveying outlet belt 8 is connected to the outlet of the inner sludge conveyor belt 9 through the outer wall of the cooling tower 1.

[0018] Embodiment 3 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 has a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is positioned above the cold water collection tank 3 via the support column 4. Inside the cooling tower 1, from top to bottom, are a spray system 5 and a packing layer 6. The sludge conveyor belt assembly 2 comprises an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly 2 is positioned above the spray system 5, while the outer part... The sludge conveyor belt group 2 is connected to the outer wall of the cooling tower 1. The sludge conveyor belt group 2 includes a sludge inlet belt 7, a sludge outlet belt 8, and an in-tower sludge conveyor belt 9. The sludge inlet belt 7 and the sludge outlet belt 8 are both outside the tower. The outlet of the sludge inlet belt 7 passes through the outer wall of the cooling tower 1 and is connected to the inlet of the in-tower sludge conveyor belt 9. The inlet of the sludge outlet belt 8 passes through the outer wall of the cooling tower 1 and is connected to the outlet of the in-tower sludge conveyor belt 9. The in-tower sludge conveyor belt 9 is a spiral conveyor belt.

[0019] Embodiment 4 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 has a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is positioned above the cold water collection tank 3 via the support column 4. Inside the cooling tower 1, from top to bottom, are a spray system 5 and a packing layer 6. The sludge conveyor belt assembly 2 comprises an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly 2 is positioned above the spray system 5, and the outer part of the sludge conveyor belt assembly 2 is connected through the outer wall of the cooling tower 1. The sludge conveyor belt assembly 2 includes a sludge inlet conveyor belt 7, a sludge outlet conveyor belt 8, and an in-tower sludge conveyor belt 9. The sludge inlet conveyor belt 7 and the sludge outlet conveyor belt 8 are both outside the tower. The outlet of the sludge inlet conveyor belt 7 passes through the outer wall of the cooling tower 1 and connects to the inlet of the in-tower sludge conveyor belt 9. The inlet of the sludge outlet conveyor belt 8 passes through the outer wall of the cooling tower 1 and connects to the outlet of the in-tower sludge conveyor belt 9. The in-tower sludge conveyor belt 9 is a spiral conveyor belt. A conveyor belt support 10 is provided inside the cooling tower 1, and the in-tower sludge conveyor belt 9 is connected to the cooling tower 1 through the conveyor belt support 10.

[0020] Embodiment 5 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 has a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is positioned above the cold water collection tank 3 via the support column 4. Inside the cooling tower 1, from top to bottom, are a spray system 5 and a packing layer 6. The sludge conveyor belt assembly 2 comprises an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly 2 is positioned above the spray system 5, and the outer part is connected through the outer wall of the cooling tower 1. The sludge conveyor belt assembly 2 includes a sludge inlet belt 7, a sludge outlet belt 8, and an inner sludge conveyor belt 9. The sludge conveying... Both the sludge inlet belt 7 and the sludge outlet belt 8 are located outside the tower. The outlet of the sludge inlet belt 7 passes through the outer wall of the cooling tower 1 and connects to the inlet of the sludge conveyor belt 9 inside the tower. The inlet of the sludge outlet belt 8 passes through the outer wall of the cooling tower 1 and connects to the outlet of the sludge conveyor belt 9 inside the tower. The sludge conveyor belt 9 inside the tower is a spiral conveyor belt. A conveyor belt support 10 is installed inside the cooling tower 1, and the sludge conveyor belt 9 inside the tower is connected to the cooling tower 1 through the conveyor belt support 10. The cooling tower 1 is connected to a municipal sludge transportation system 11 and a drying sludge transportation system 12. The municipal sludge transportation system 11 is connected to the inlet of the sludge inlet belt 7, and the drying sludge transportation system 12 is connected to the outlet of the sludge outlet belt 8.

[0021] Embodiment 6 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 has a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is positioned above the cold water collection tank 3 via the support column 4. Inside the cooling tower 1, from top to bottom, are a spray system 5 and a packing layer 6. The sludge conveyor belt assembly 2 comprises an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly 2 is positioned above the spray system 5, and the outer part is connected through the outer wall of the cooling tower 1. The sludge conveyor belt assembly 2 includes a sludge inlet belt 7, a sludge outlet belt 8, and an inner sludge conveyor belt 9. The sludge inlet belt 7 and the sludge outlet belt 8... All belts 8 belong to the external part of the tower. The outlet of the sludge conveying inlet belt 7 passes through the outer wall of the cooling tower 1 and connects to the inlet of the sludge conveying belt 9 inside the tower. The inlet of the sludge conveying outlet belt 8 passes through the outer wall of the cooling tower 1 and connects to the outlet of the sludge conveying belt 9 inside the tower. The sludge conveying belt 9 inside the tower is a spiral conveyor belt. A conveyor belt support 10 is provided inside the cooling tower 1, and the sludge conveying belt 9 inside the tower is connected to the cooling tower 1 through the conveyor belt support 10. The cooling tower 1 is connected to a municipal sludge transportation system 11 and a drying sludge transportation system 12. The municipal sludge transportation system 11 is connected to the inlet of the sludge conveying inlet belt 7, and the drying sludge transportation system 12 is connected to the outlet of the sludge conveying outlet belt 8. The sludge conveying belt 9 inside the tower is located in the upper middle part of the cooling tower 1.

[0022] Embodiment 7 of this utility model: A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower 1 and a sludge conveyor belt assembly 2. The cooling tower 1 has a cold water collection tank 3 and a support column 4 at its bottom. The cooling tower 1 is positioned above the cold water collection tank 3 via the support column 4. Inside the cooling tower 1, a spray system 5 and a packing layer 6 are arranged sequentially from top to bottom. The sludge conveyor belt assembly 2 comprises an inner part and an outer part connected sequentially. The inner part of the sludge conveyor belt assembly 2 is positioned above the spray system 5, and the outer part is connected through the outer wall of the cooling tower 1. The sludge conveyor belt assembly 2 includes a sludge inlet belt 7, a sludge outlet belt 8, and an inner sludge conveyor belt 9. The sludge inlet belt 7 and the sludge outlet belt 8 both belong to the outer part of the tower. The sludge inlet belt 7... The outlet of the sludge conveyor belt 9 inside the cooling tower 1 is connected to the inlet of the sludge conveyor belt 9 inside the tower through the outer wall of the cooling tower 1. The inlet of the sludge conveyor belt 9 inside the tower is connected to the outlet of the sludge conveyor belt 9 inside the tower through the outer wall of the cooling tower 1. The sludge conveyor belt 9 inside the tower is a spiral conveyor belt. A conveyor belt support 10 is provided inside the cooling tower 1, and the sludge conveyor belt 9 inside the tower is connected to the cooling tower 1 through the conveyor belt support 10. The cooling tower 1 is connected to a municipal sludge transportation system 11 and a drying sludge transportation system 12. The municipal sludge transportation system 11 is connected to the inlet of the sludge conveyor belt 7, and the drying sludge transportation system 12 is connected to the outlet of the sludge conveyor belt 8. The sludge conveyor belt 9 inside the tower is located in the upper middle part of the cooling tower 1. The cold water collection tank 3 is connected to a power plant condenser 13, and the power plant condenser 13 is also connected to a spray system 5.

[0023] The working principle of one embodiment of this utility model is as follows: The support column 4 of this utility model has a hollow structure, through which surrounding cold air can enter the cooling tower 1. After the surrounding cold air enters the cooling tower 1 from the bottom, it forms a temperature difference and a density difference with the hot water in the packing layer 6. The higher the gas temperature, the lower the density, so the hotter air moves upward. Due to the structure of the cooling tower 1, it forms an accelerated motion. After the hot air moves upward, the air pressure at the bottom decreases, and the outside cold air will replenish it, reheating it and accelerating upward to form a gas circulation. The hot water in the power plant condenser 13, after passing through the packing layer 6 and contacting the surrounding cold air, loses heat through heat exchange and finally becomes cooling water flowing downward into the cold water collection pool. The water can be returned to the power plant condenser 13 for reuse; municipal sludge is transported to the sludge conveyor belt 7 via the municipal sludge transport system 11 and enters the cooling tower 1. At this time, the sludge conveyor belt 9 is located in the middle of the cooling tower and above the hot water spray nozzle of the spray system 5; the municipal sludge is spirally transported from bottom to top in the cooling tower 1 by the spiral sludge conveyor belt 9. This spiral structure can increase the length of the conveyor belt and increase the contact time between the municipal sludge and the upward-moving hot air in the cooling tower 1, ensuring the drying effect; after drying, the sludge is transported out of the cooling tower 1 via the sludge discharge belt 8 and enters the drying sludge transport system 12. After the entire drying process, the moisture content of the municipal sludge can be reduced from 80% to 30%.

Claims

1. A sludge drying system utilizing waste heat from a power plant cooling tower, comprising a cooling tower (1), characterized in that, It also includes a sludge conveyor belt assembly (2). The bottom of the cooling tower (1) is provided with a cold water collection tank (3) and a support column (4). The cooling tower (1) is arranged above the cold water collection tank (3) through the support column (4). The cooling tower (1) is provided with a spray system (5) and a packing layer (6) from top to bottom. The sludge conveyor belt assembly (2) includes an inner part and an outer part connected in sequence. The sludge conveyor belt assembly (2) in the inner part is placed above the spray system (5), and the sludge conveyor belt assembly (2) in the outer part is connected through the outer wall of the cooling tower (1).

2. The sludge drying system utilizing waste heat from a power plant cooling tower according to claim 1, characterized in that, The sludge conveyor belt assembly (2) includes a sludge inlet conveyor belt (7), a sludge outlet conveyor belt (8), and an in-tower sludge conveyor belt (9). The sludge inlet conveyor belt (7) and the sludge outlet conveyor belt (8) are both outside the tower. The outlet of the sludge inlet conveyor belt (7) passes through the outer wall of the cooling tower (1) and is connected to the inlet of the in-tower sludge conveyor belt (9). The inlet of the sludge outlet conveyor belt (8) passes through the outer wall of the cooling tower (1) and is connected to the outlet of the in-tower sludge conveyor belt (9).

3. A sludge drying system utilizing waste heat from a power plant cooling tower according to claim 2, characterized in that, The sludge conveyor belt (9) inside the tower is a spiral conveyor belt.

4. A sludge drying system utilizing waste heat from a power plant cooling tower according to claim 2, characterized in that, The cooling tower (1) is equipped with a conveyor belt support (10), and the sludge conveyor belt (9) inside the tower is connected to the cooling tower (1) through the conveyor belt support (10).

5. A sludge drying system utilizing waste heat from a power plant cooling tower according to claim 2, characterized in that, The cooling tower (1) is connected to a municipal sludge transport system (11) and a dried sludge transport system (12). The municipal sludge transport system (11) is connected to the inlet of the sludge conveying belt (7), and the dried sludge transport system (12) is connected to the outlet of the sludge conveying belt (8).

6. A sludge drying system utilizing waste heat from a power plant cooling tower according to claim 2, characterized in that, The sludge conveyor belt (9) inside the tower is placed in the upper middle part of the cooling tower (1).

7. A sludge drying system utilizing waste heat from a power plant cooling tower according to claim 1, characterized in that, The cold water collection tank (3) is connected to the power plant condenser (13), which is also connected to the spray system (5).

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